Without even thinking, you jerk your foot out of the puddle... and find that you're no longer wearing the shoe on it that you were before. Instead, you seem to be wearing a big costume foot, maybe some sort of bunny. Given that this formed within a period of about a second, you're extremely impressed with the quality - the big pink foot has three adorably round toes, each colored a milky white that wraps around to the bottom, and overall it almost looks like a costume part for a chubbier, pinker Bugs Bunny.
But enough of that, you should take the thing off in case it's going to try eating your foot or something. Gripping its smooth latex you give it a pull, and it lets out an audible pop of suction as your foot escapes it. Now that you aren't wearing it, you can see that the inside of the shoe is made of the same latex as the outside. Apparently, it's been changed all the way through.
Seeing no apparent danger in it, and with your foot getting rather cold, you put the bunny foot back on. Now you just need to decide what to do next.